> ## Documentation Index
> Fetch the complete documentation index at: https://docs.nuwa.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# MCP

> Overview and choices for building or proxying MCP with Nuwa

## MCP in Nuwa

Via the Model Context Protocol (MCP) protocol, your Cap can call external tools for data, actions, or even [return an interactive UI](/build-caps/mcp-ui). You can integrate the Nuwa Kit to your existing MCP server to make it compatible with Nuwa Client and be a part of a Cap.

## Choose your path

<CardGroup cols={2}>
  <Card title="Proxy an existing MCP" icon="right-left" href="/build-caps/mcp-proxy">
    Keep your upstream as‑is and add pricing/DIDAuth at the edge.
  </Card>

  <Card title="Migrate MCP server" icon="bolt" href="/build-caps/mcp-server">
    Implement tools directly with schemas and pricing using the Payment Kit.
  </Card>
</CardGroup>